zen mode is an interesting option to have. I am afraid I don't have a solution to offer here. However, the edit field is, essentially created by edittext widget. Edit text widget has a property called focuspopup. Which means, there exist a mechanism to "if edit field has focus, do this". If you can find that mechanism and replicate it for revealing a bunch of styles that hide the rest of TW when edit field has focus, you ll have what you want I guess.
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